Hotjse electric



May 15, 1928.

C. AALBORG THERMAL CONTROL DEVICE Filed Sent. 3, 1919 2 sheets sheet 1 WITNESSES:

ATi'ORNEY May 15, 1928. 1,669,544

c. AALBORG THERMAL CONTROL DEVICE Filed Sept. 5, 1919 2 Sheets-Sheet 2 9 i :zl a I --1' I o II/II, TI? L if F/yf I --*"1 2 C l'w'lilv i fik I v i A 1 l l l f 6 f 17 1 /a 0 I Q I 4 l I I I 8 A9 I I l l WITNESSES: INVENTOR V BY I a ATTORNEY mg 1 and is rigidly fastened, atone end, to

Patented May 15, 1928.

' UNITED STATES. PATENT O-FQFI ofinrsmnn cannons, or WILKINSBURG,

nousn nnnczrar yams.

PENNSYLVANIA, ASSIGNOR TO WESTING- c a'mornoronmc' COMPANY, A CORPORATION or rsuNsYL:

THERMAL common DEVICE.

"Application filed September 3, 1919. Serial Ito-321,459.

My invention relates to thermal control devices and particularly-t0 electrically operated-types of such devices.

The-object of my invention is-t-o provide a compact andreliabl means that shall simple-and easy to construct, for control-. ling-the temperatureof a -.water tank or some similar heat-storage device.

Ordinarily, an electrically heated apparatus embodies aheatingzelement composed of iron wire or 'heavyiron-grids. The temperatureof the apparatus-is kept approximately constant by alternately closin and interrupting a circuit including the heating element.

Inpracticing myinvention, I provide a compact control device comprising a helically-wound bi-metallic spring, a motor and a-switchgall enclosed in :a dust-proof casing. lni'theaccompanying drawings, Fig. .1 1s aside sectional elevation, and Fig. an end elevation of the device; Fig. 3 is a side elevation :and Fig. et-an end elevation of the thermostat; Fi 5 is 'a-diagrannrmtic view of'a system em odying mylinvcntion; and Fig. -6 is'a .front 'elevational .view of the snap switch taken along the line VI-VI.

In Figs. 1 and 2, a casing Lencloses a device comprising a bi-inetallic helical spring 2, a switch 3 and a motor 4. The bi-metallic spring 2' extends into a housing 5 of the eas- ':i cylindrical rod 6 which, in turn, is fastened, at the opposite end, to a movable member 7. The movable member 7 may be adjusted by a handle 8. Friction between the movable member 7 and a fixed member 9 serves to hold the former in any position to which it may be adjusted by means of the "handle 8. A movable contact member 10, supported by the free end of the bimetallic spring 2, is adapted to engage the contact end of the one or the other of screw members 11 and 12. Each of the members 11 and 12 is surrounded by a coil 13. The switch 3, comprising a blade 14, jaws 15, 1G, 17, 18nd 19 and a spring 20, is actuated by the motor 4:, through earing 21. The housin 5 is disposed in a heat-storage device 22.

%i 3 and 4 show more clearly the bimeta lic helical spring 2 and its housing 5.

In Fig. 5, the arrangement of the parts is indicated approximately as they are located. Three conductors 23, 24 and 25 are connected to the switch jaws 15, 16 and respectively: The motor 4 is connected be;

tween the. switch jaw ,16 and thermovable contact-member--1Q. The switch-jaw ,16-is employed for-convenience merely as a bind mg post. connected by a conductor 18; and the switch jaws 15 and 19. are arespectivelymonnected to the outer ends of the respectiveicoils, 13. The other end of'each coilli'iisconnected to the contact end of the member.up0n-'wl 1ioh it is supported. A- resistor. 26 of the heatstorage device-22 is connected between two conductor-s23 and fIwo .-conductors 24 and 25 are connected to a source of current (not, shown). I

Fig.- 5 shows the position of the switch and'the movable. contact member 10 while the heating element 2,6..bf the heat-storage device 22 is beingienergized.

As the, temperature in the heat-storage device 22 increases beyond a predetermined value, the biemetallic :helicalspring 2- will expand and,'being-hel ica.lly wound, will tend to move the contact member-n10 to engage the contact faceofthememben12.- .The cor-. responding coil 13 thus becomes energized and serves to hold the contact member 10 in engagement with thecontact'face of the member. l2, th erehy, completing the circuit of the motorgl. The motor at operates, through the "spring 20, to actuate the switch 3, thereby opening the circuit of the motor 4 and that of the heating element 26 of the heat-storage. device 22. The switch blade 14 now engages the switch jaws 17 and 19. As the temperature of the device 22 decreases to a predetermined value, the movable member 10 engages the contact face of the member 11 and thus completes the motor circuit. The switch 3 is again actuated, and the heating element 26 is again energized to heat the device 22.

The operating mechanism of the snap switch 3 comprises the spring 20, a shaft 30 having a pinion 31 disposed thereon, a latch 32 that is controlled by the inion 31, and a stationary stop 33 of rate et-shape that co-operates with the latch 32 to limit the movement of the switch to a right-angle turn.

One end of the spring 20 is secured to the structure of the blade 14: and the other end is secured to the shaft 20. As the shaft 20 The switch jaws 17 and -18 -,are.

-casing 1f" It will be unclei'stoodthat-my Invention is- 1 r do is turned, the pinion 31 moves the latch 32 in its guideway; 34: to moye a dog portion ratchet-shaped stop 33. As the (leg portion. El5,clea :s ,t lie,end .otethe ,too th 36, the .ten;

ouie'l-p'esirionf Thematic-"'14 and th'e'o crating mechanism comprisingthe movab e elements, namely, the latch 32 and the guideway 34, are mcehanicallysecurcrl and turn, together to the next position of the switch.

-The dog portion engages the-next tooth 37 -hnd preeludes ri'urther movementof the ti-l the spring is again tcnsined:'

switch 'un Supporting: bracket-i323 is provided for -supporting the switch 3' und'th'e motor=4-in the riot limi-ted trthe-strueture herein set forthg as t'arious'modificution's maybe made with i out depurtin it'ronr the" spirit and sco'pe -of casing for eiiclo'srig 'szrid thermull-y 'respon' sire element; '"suppo' rting and adjusting means, sup er-ting bracket,- switch and OP- eiatifig"'meuusftliereint 2AA unitary heater' ntrcuer of the-bayon't'typ'e comprising a casinghuving a pertua'tinjg'suiilj-switch, 'a sup'porting bracket r heiswms secured to said casing for supporting said snaps-switch; and rotatable. means a vtherm'fll'y responsive reiemeimaispqedj said cesingportion for controlling said rotatable means in ac.cordance with the temperature and adjusting e'ans' forsaldt'hermjilly-rc- ,sponsiye lnember mounted on said'cflsin'g.

3. sedate? controller comprising a casing having-a portiorrudqpted to be subjected to the temperature of a device to be controlled, a circuit 1 controlling -dervice, -means for actuating- ISflld --dontrolling. device, ta ,bracket mounted on said=cesing for-supporting said circuiteqontrollingdevice :and said Iactuatmg ime'a-ns, disposed inisaidlportion for COIlbl'OlllIlgiSflid actuating means in accordance with the temperature of the1devicertmbeucontrolletl, and a .esupportitngiiand adjustinggmeans for said element(for1controlling;:the;-temperatui-e at which :s'sfid controller is-operable.

- unitary heater: controller'- for: regulating-the temperature =of a heatrstorage receptacle comprising :a casing, 421- -portionof which is adapted to be inserted in said receptacle; :a s witch,- ea. motor; :0 .sup porting bracket mountedlon said operati-v'el-y iengug ing; said-switch and-motor V casing =f0r support-. mg said iswitchgnzndmiotorpa s'prmgi member :b: thenmallyriesponsivekelement- 1 adapted" to 'store' energy? rt romrthe :moton for causing Lthe%' -'s\iitc h :to' 0perate. .in. response. to rotation of tlie 'rhotor .W'ithifls'nzipaction,

a-- 'th'ermully espomive: s etement located. am said portion: aforcoutrollingntlie circuit. c0n'-. nectionsof :said motor ,i'n- ==aecondance with the temperatiires ofcsaid :cece'ptaele, and a cover-inemoeisecunedto said-teasing -for enclosing the switch5 spriug, supportingbracket 1 and tliei'mally responsive.mlement therewithin; f

' In testimonymvhereoi,1 "have hereunto subscribed any heme -this;26th day of Aug, 1919. I

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